Joseph dennis



J. DENNIS.

(No Model.)

LOCK.

No. 543,679,. Patented July 30, 1895.

UNITED STATES PATENT OFFICE.

JOSEPH DENNIS, OF HOT SPRINGS, SOUTH DAKOTA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 543,679, dated July 30,1895.

Application filed April 11, 1895.

Serial No. 545,347. (No model.)

clear, and exact description of the invention,

which will enable others skilled in the art to which it appertains tomake and use the. same, reference being had to the accompanyingdrawings, which form a part of this specification, and in which- Figure1 is a perspective view of my improved door-lock removed from the lockmortise or recess in the door. Fig. 2 is a longitudinal sectional viewof the same, showing it in position in the door on a vertical planethrough the axis of the cylindrical barrel or casing.- Fig. 3 is asectional view of the same on the horizontal plane indicated by thebroken line marked yy. Fig. 4 is a transverse vertical sectional viewthrough the barrel and bolt on line mm. Fig. 5 is a similar view of thesame parts on the parallel transverse plane indicated by the broken linemarked 2 a. Fig. 6 is a detail view of the sleeve with its springappertaining to one of the door-knobs, and Fig. 7 is a view of the keys.7

Like letters of reference designate corresponding parts in all thefigures.

This invention has relation to door-locks of that type in which the boltis withdrawn to. open the door either by pulling or pushing upon thelock knobs or handles instead of turning them, as usual; and it consistsin the the bolt-shield O, which is an oblong metal plate having acentral aperture through which the locking-bolt D plays, and smallercountersunk appertures a a for the insertion of the screws by which theplate is fastened upon the front edge of the door, as usual.

Inserted movably within the hollow cylinder B is a cylindrical bolt D,the forward end of which is reduced on one side (1 and beveled on theopposite side I), as usual, to enable it to easily enter and interlockwith the catch-plate on the door jarnb or casing. (Not shown.) The rearend of bolt D is bifurcated, so as to form two parallel limbs E E,connected by a crosspin F. The cylindrical casing B, opposite to thispin F, has two oblong apertures f and f for the insertion of the spindleG G, which, at the point where it passes through the recess e formed inthe rear end of the bolt by the limbs F F and in alignment with thetransverse pin F, has a jag or offset g formed by bending it to form aslanting middle section between and connecting the two straight ends Gand G, the said slanting offset 9 bearing against the pin F, as clearlyillustrated in Fig.' 3.

The forward end of bolt D, just back of its beveled end or tongue, has avertical recess h containing a helical spring H, the inner end of whichbears against a shoe 1, fitting loosely within the recess h at thefarthest end of the same, and fastened to the top of the cylindricallock-casing B on the inside by means of a small screw 1'. Thus it willbe seen that the force or tension of spring H operates normally to forcethe beveled end or tongue of the locking-bolt D out of its casing,causing it to engage or interlock with the registering lock-plate andmortise on the adj aoent door-jamb (not shown) when the door is closed;but the bolt may be easily and instantly withdrawn from this lookingposition simply by either pushing the handle-knob J in the direction ofthe arrow-21a, toward the lock-or (what of course amounts to the samething) pulling upon the opposite knob J, the jag or middle olfsetg inthe knobspindle G G in either case hearing against the cross-pin F inthe bifurcated rear end of the bolt, so as to (overcoming the tension ofspring H) push the bolt back within its casing, and thus release it fromits interlocking fastening, thus opening the door by pushing orpullingupon the handles, instead of turning these, as in door-locks of theusual construction. .To' facilitate this sliding movement of theknob-spindle and knobs or handles, the lock-plate K on one side of thedoor'is constructed with the sleeve L, one end of which ICO Z enters amortise madein the door to receive it, while the other end projectsoutwardly from and at right angles to the lock-plate, so as to form acollar for the cylindrical stemj of the knob or handle J on that side, astill helical spring M being inserted within the sleeve L Z, so that itwill push against the adjacent inner end of the cylindrical knob-stemj,which abuts against it within in collar L, and thus normally maintainthe spindle G G in the position shown in Fig. 3, which leaves bolt D inits projecting or locked position; but by pushing upon the knob J, orpulling on the opposite knob J, so as to overcome the force or tensionof the spindle-spring M it will be perceived that the horizontalslanting offset Q will be brought to bear sidewise against the adjacenttransverse and horizontal cross-pin F, pushing this back and thusgradually withdrawing bolt D until it is entirely released from itscatch and the door unlocked.

In order to, if desired, keep the door locked, the knob J is provided onits inner side with a small hook m, adapted to engage a catch or stud itupon the sleeve L appertaining to knob J, so that by slightly turningthe knob the hook m will overlap and engage the catch 71, and thusprevent either knob J or J from being moved, thus keeping the doorfirmly locked without the use of the key. In Fig. 4 I have shown thestud n in engagement with this locking-hook m. In addition to this,however, and in order that the bolt may be locked, so as not to beopened by any manipulation of the knobs J J and spindle G G, I provide asmall recess 0 in the body of bolt D, just in front of its bifurcatedlimbs E E, into which a small tumbler-lock O is inserted, adapted to beoperated by a key P, which may be inserted into the lock 0 throughkeyholes p p, from either side of the lock-casing, the key P being madewithashank of sulficientlength to reach through the thickness of Wood onboth sides of the look, so that the wards of the key may properly engagethe tumblers which operate a bolt 7', engaging a slat s in the top ofthe cylinder B. In this simple manner it will be observed that the boltD may be locked independent of the side knobs or handles, and in suchaway that it cannot be opened except with the aid of the key P; but byinserting this key into the bolt-lock 0 from either side, the smallvertical bolt 1" may be withdrawn from its interlocking recess .9,

thus permitting the door to be again opened by pushing upon knob Jorpulling the knob J, as before.

From the foregoing description, taken in connection with the drawings,it will be seen that my improved lock occupies very little space, allits operative parts being confined within the cylinder B, which is ofsuch shape and size that it can easilybe inserted into an auger-holebored into the door from the front edge, another hole being boredthrough the hole at right angles to and intersecting the lock bore orrecess for the insertion of the spindle and its appurtenances.

Not only is this look exceedingly solid and compact, but owing to itssolidity and compactness, and the simplicity of its construction, it isnot liable to get out of order, even if roughly used and handled.

Having thus described my invention, I claim and desire to secure byLetters Patent of the United States- 1. The improved door-lock hereinshown and described, comprising the cylindrical casing B; bifurcatedbolt D sliding therein, having body-recesses h and 0 and provided withthe cross-pin F at its bifurcated rear end; spring I-I fastened tocasing B by the shoe I and its screw '5; tumbler-lock O; and spindle G Ghaving central slanting jag or offset g engaging the cross-pin F andprovided with the end-knobs or handles J, J; all constructed andcombined to operate substantially in the manner and for the purposeshown and set forth. I

2. The combination with the cylindrical lock-casing B, bifurcatedsliding bolt D E F, and spindle G G having central horizontal slantingjag or offset 9 and provided with the end knobs J J, of the sleevesLl'and L, spring M, and catch a fastened upon sleeve L and adapted toengage and interlock with a hook at upon the adjacent innerside or faceof the knob J appertaining to sleeve L; substantially as and for thepurpose herein shown and set forth.

In testimony that I claim the foregoing as my own I have hereuntoaflixed my signature in presence of two witnesses.

JOSEPII DENNIS. Witnesses:

E. B. VVARREN, J OI-IN W. BENTLEY.

